Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
keezy - A colorful soundboard. Play with music.
cassini - Polyphonic Synthesizer for iPhone/iPod touch
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
zMors Modular - Full featured modular synthesizer for iOS
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.